diff --git a/src/ppclock/bridge.py b/src/ppclock/bridge.py
index 292d7b8..b7e542a 100644
--- a/src/ppclock/bridge.py
+++ b/src/ppclock/bridge.py
@@ -76,7 +76,8 @@ class BridgeTransport:
                 if not devices:
                     raise BridgeError(f"bridge 未发现 {self.name_prefix!r} 前缀设备")
                 self.address = devices[0]["address"]
-            await self._rpc("connect", address=self.address, timeout=self.timeout)
+            await self._rpc("connect", 90.0 + self.timeout,
+                            address=self.address, timeout=self.timeout)
         except Exception:
             await self._teardown()
             raise
@@ -122,15 +123,16 @@ class BridgeTransport:
                     fut.set_exception(BridgeError("bridge 连接中断"))
             self._pending.clear()
 
-    async def _rpc(self, op: str, timeout: float = 30.0, **kw) -> dict:
+    async def _rpc(self, op: str, _timeout: float = 30.0, **kw) -> dict:
         self._next_id += 1
         rid = self._next_id
         fut = asyncio.get_running_loop().create_future()
         self._pending[rid] = fut
-        self._writer.write(json.dumps({"id": rid, "op": op, **kw}).encode() + b"\n")
+        payload = {"id": rid, "op": op, **kw}
+        self._writer.write(json.dumps(payload).encode() + b"\n")
         await self._writer.drain()
         try:
-            resp = await asyncio.wait_for(fut, timeout)
+            resp = await asyncio.wait_for(fut, _timeout)
         finally:
             self._pending.pop(rid, None)
         if not resp.get("ok"):
@@ -147,12 +149,13 @@ class BridgeTransport:
         return bytes.fromhex((await self._rpc("read", char="rxtx"))["data"])
 
     async def request_device_id(self, timeout: float = 8.0) -> str:
-        return (await self._rpc("request_device_id", timeout=timeout + 5))["device_id"]
+        return (await self._rpc("request_device_id", timeout + 15,
+                                timeout=timeout))["device_id"]
 
     async def run_ota(self, image: bytes, on_progress=None):
         self._on_progress = on_progress
         try:
-            return await self._rpc("ota", timeout=600.0, image=image.hex())
+            return await self._rpc("ota", 600.0, image=image.hex())
         finally:
             self._on_progress = None